Ventilating hood



9, 1925 2 Sheets-Sheet 1 I n M Filed Me" ATTORNEY.

March 16,192a 4 1,977,307

H. w. SHEEL.

VENTILATING HOOD Filed May 19, 1925 2 Sheet-Sheet 2 j v I Z2 flfifiZM/VENTOR.

1 7 In W 4 4 ATTORNEY.

Patented Mar. 16, 1926.

2 UNITED STATES HERMAN w. snnnL,

F DECORAH,; IOWA.

VENTILATING Hoo 'Applieation filed May 1a, 1925. Serial no. 31,355.

ToaZZ whom it may concern.- v y Y Be it known that I, HERMAN W. SIIEEL, a, citizen of the United States, residing at Decorah, inthe county '01" lVinneshiek and State of Iowa, have invented certain new and useful Improvements in Ventilating Hoods, of which the followinsgis a specification.

This invention relates to fume hoods of the type .used in chemical laboratories. I

The primary object of this invention is the provision, in a manner as hereinafter set forth, of a fume hood which may be located upon the work table of the chemist or chemistry student, in a handy location for use and further having means for conveying any noxious fumes being evolved through pasways leading'irom the hood in such a manner that they willvbe out of sight-rand out of the way,

Another object of the invention is the provision, in a manner as hereinafter set forth, of a fume hood so. designed that it may be placed in the center of a double work table and be used from both sides, by two persons, a common lead off passage way serving for bothsides of the hood.

Another object of theinvention is the provision, in a manner as hereinafter set forth, of means for supporting apparatus needed in connection with the. operation or use of a hood, or in other chemical operations. 7. v

Still another object of the invention is the provision, ina manner ashereinaiter set iiorth, of a single or double fume hood having a new and novel means for regulating the 'draughts'therethrough.

- The linal object .of the invention is the provision, in a manner as hereinafter set forth, of a chemical fume hood of simple but strong construction, exceptionally eth cient in lotion, and inexpensive to manuiao ture and setup in position;

The inventionwvill be best understood from a consideration of the' following detail-ed description taken in connection with the accompanying drawing forming a part of this spe ion,with th understa di g thattheYinvention is not confined to any strict conformity with the showingot the drawing but may be changed and modified solong as such changes and modifications mark no material departure from thesalientteatures of the invention as expressed in the appended claims,

In the drawing Figure 1 is a front elevation of the hood embodying this invention showing clainp support rods connectedthereto.

V Figure 2 is atop plan view of the showing of Figure l.

Figure Sis a sectionitalzen upon the line 3-3 of Figure 1 7 Figure i is a section taken upon the line %i of Figure 1.,

Figure 5 is a detailed sectional view showing-the mannerin which the clamp'support rods are secured to the hood.

Referring now to the drawing in detailwherein like numerals of reference indicate corresponding parts throughout the several views, the double hood constructed in ac cordan ce with the invention comprises primarily an elongated body of metal having the edges rolled as indicated at l and having two bends 2 transversely thereof, in spaced relation and adjacent the central por ion of the body. When the body is bent at these two points there is formed two spaced parallel portions which constitute vertical sides 3 and the connecting portion constitutes the top oi the hood. There is thus formed an inverted substantially U -sh-aped member, the lower edges of the sides 3 being bent back upon themselves as at 5 to provide flanged edges. 7

The top, a is provided along its central portion withatransversely extending series of apertures 6, the purpose-of which will become apparent as the description of the in vention proceeds.

Secured across between the side walls 3 of the body and extending throughout the length thereof. is a series of spaced parti tions, a pair, of outer partitions 'Z and an intermediate partitionS. These three partitions have their edges flanged as at 9, and through the side flanges of the partitions and the top flange of the inner one are passed rivets or bolts .10 through the top and sides of the body as is shown and, when the'body is in position upon the-table 11, th bottom flanges rest upon the surta e f the table.

The upper portion or" each of the outer partitions 7 has cut therethrough the passage 12, and as shown clearly in Figure 4 when the flanges 9 formed along the side edges of these outer partitions are su ficient- 1y turned to turn back the portl ns f he flange upon itself as indicated at L-l this turned back portion extends beyond the inner side of the partition and is turned across the inner face thereof and spaced therefrom to provide the tongues 14. These tongues extend throughout the length of the inner edge of each of the outer partitions 7.

Slidably held against the inner face of rach of the partitions 7 bymeans of the tongues it is a gate or door and secured to the upper edge of each of the gates 15 a rod bar 16 which projects through an inner one of the openings 6 to extend be yond the top of the hood body and each of these rods has upon the upper end thereof the crown nuts 1?. The spring tension 0. erted by the tongues let against the gates 16 serves to frictionally hold the gate in any desired adjusted position.

Secured across the top of said body is a reinforcing plate 18 and through each corner of this plate and through the top of the bod is passed a bolt 19 the head of which engages the under surface of the top it while the shank extends a substantial distance above the top of theplate 18. Encircling each of the bolts 19 is a threaded collar 20 which secures the plate to the top of the hood and seemed to each of the bolts 19 by the projection of the bolt through a transverse bore therethrough, is a brace rod 531. This brace rod is held securely against the collar 20 by means of the wing nut 22 which is threaded upon the bolt 19 and bears againitthe rod as shown in Figure 5.

fihesc rods 21 as is shown in Figure 2 extend outwardly from the hood body at various angles and each carry thereon a double clamp which is designed to grip a vertical support rod 221-. lVith this an rangenieut of sujn'iorting rod 21 extending from the top of the hood body and gripping vertical rods 24. additional rigidity is given to the vertical support rods, and further ctmreniently located adjustable means is provided for the support of holding de vices such as evaporating dish holders indicated by the numeral 5, for supporting articles within the hood. It will be readily seen that by loosening the wing nuts the horizontal rods 2t can be swung as de sired to position the vertical rods 24.- around at one side of the hoou or bring the same forward to a position in front of the hood so that holding devices such as that indi rated by the numeral which are clamped upon thrrertical rods 2 t may be more readily located within the hood. By the arrange ment of a cross support, a thermometer may he so suspended a: to allow the bulb there of to extend through the outer one of the apertures G to the interior of the hood for keeping a check upon the temperature therein.

lihen the hood embodying this invention is in position upon the table 11, it is located above an opei'iing in the table from which opening there extends a fume lead-oft pipe 26, the mouth of which is of the same size as the lower end of the compartment formed between the two outer partitions 7. Any number of these lead-oil pipes 26 may be connected to a main lead-elf pipe and proper suction. means connected therewith to maintain a continuous draught through the opengates 15 of the hood and through the leadoii pipes 26.

From the foregoing description it will be readily seen that there has been provided a new, novel and v ry efficient laboratory fume hood which may be very conveniently used in that it has no overhead lead-ofl' pipe, and further due to its compactness, it can be located at a convenient point for the user.

I claim:

l. A fume hood of the character sct forth, comprising a body having top and side walls and open front and rear, a central partition in said body, di iding the same into two portions, a pair of partitions spaced from and one on each side of said central partition to provide fume chambers at the rear of each section, each of said last men tioned partitions having an aperture through the upper part thereof, means for adjustably closing said apertures, and a fume lead-off from the lower portion of the fume chanr bers.

2. A double fume hood of the character set forth, con'iprising a body having top and side walls and open front and rear, a central partition in said body, dividing the same into two portions, :1 pair of partitions spaced from and one on each side of said central partition to set up in connection therewith a fume chamber at the back of each said portion, said last mentioned partitions having an aperture through the upper part thereof, and each of said free partitions having their edges turned at right angles to set up securing flanges, a spring tongue formed from the said securing flanges of said pair of partitions, a gate for said apertures frictionally held by said spring tongues, controlling means extending from said gates through the top of said body, and means for conveying fumes from. the lower portions of said fume chambers.

In testimony whereof, I afii); my signature hereto.

HERMAN w. suntan, 

